(19)
(11) EP 0 812 562 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.02.1999 Bulletin 1999/05

(43) Date of publication A2:
17.12.1997 Bulletin 1997/51

(21) Application number: 97107699.7

(22) Date of filing: 12.05.1997
(51) International Patent Classification (IPC)6: A47L 5/22, A47L 9/22
(84) Designated Contracting States:
DE FR GB

(30) Priority: 12.06.1996 IT PD960156

(71) Applicant: Rotafil S.a.s. di Vincenzo Massaro E C.
35100 Padova (Fraz. Camin) (IT)

(72) Inventor:
  • Massaro, Vincenzo
    35129 Padova (IT)

(74) Representative: Modiano, Guido, Dr.-Ing. et al
Modiano & Associati S.r.l. Via Meravigli, 16
20123 Milano
20123 Milano (IT)

   


(54) Sealing device for dust- and liquid-aspirating machines


(57) A sealing device for dust- and liquid-aspirating machines, comprising an electric motor (11) provided with a shaft (12), to a cantilevered free end (14) whereof an axial suction impeller (15) is fixed, the impeller (15) being contained in a casing (16) wherein one or more delivery ducts (17) are formed peripherally. The device further comprises an axially perforated disk-shaped element (18) associated with the shaft (12), interposed between the motor (11) and the casing (16), and having a perimetric surface shaped so as to form at least two successive tapering regions (25,28) between which a change in diameter is interposed and forms a step (20), the configuration of the disk-shaped element (18) being adapted to repel the liquid by centrifugal action and to dissipate its energy in association with the facing surface of a flanged sealing element (21) having a hollow section (22) that encapsulates part of the electric motor (11), and a flange (23) connected to the casing (16) upon assembly.






Search report